Hey y'all. Trying to track down a wiring issue on my 74 Barracuda after leaving the key in the run position by accident for at least 3 weeks. I went to move the car and found it, tried to start it and no go. Turns over but no spark with the Mopar msd 6al box. I tested the box and its good. For some reason when I rewired the engine bay of this car years ago I triggered the msd box in run off the oil pressure/gauge terminal, position 17 (g6?) in my bulkhead. I deleted all the unused circuits then and must have used it considering it was a free keyed 12v source? I also left the ballast for whatever reason. Anyway, Im sure I could trigger the box there but I really would like to know what I burned up leaving the key on. No blown fuses, no obvious burnt wires that I can see crawling under the dash. There is no power on the inside at the bulkhead on #17 either. I tried to track the circuit in a service manual but I don't totally understand where this goes, how it works. Anyone out there that can read wiring diagrams better than me and can explain it to a moron?

At first I thought it was ignition switch related but everything seems to be doing its job there. Non rallye cluster, no oil gauge etc

Thanks!

I didn't see where you charged the battery up. Might be the voltage is too low to allow the MSD to work. Charge the battery up and try again.

Sorry, forgot to mention good charged battery. every connection I could check is good. so far its the only thing affected but I haven't run the car off a new wire until I feel good about it. Thanks

Might try a different coil, it may have overheated and cooked itself